Y=3x -7
you can figure this out or check if it’s correct by using point slope formula,
which is : y-y1=m(x-x1)
y1=-4, x1=1, and m=3 :)
If x is the distance the base of the ladder is from the wall, and y is the distance to top of the ladder is up the wall, then the Pythagorean theorem tells you
... x² + y² = 10²
Differentiating with respect to time, we have
... 2x·dx/dt + 2y·dy/dt = 0
... dy/dt = (-x/y)·dx/dt
We are given x = 6 ft and dx/dt = 3 ft/s. Using the first equation, we can find y as
... y = √(10² -6²) = 8
Then
... dy/dt =(-6/8)·(3 ft/s)
... dy/dt = -2.25 ft/s
The top of the ladder is sliding down the wall at -2.25 ft/s.
= a₁ + d(n - 1)
In the given problem, a₁ = 15 and d = 3
= 15 + 3(n - 1) = 15 + 3n - 3 = 3n + 12
= 3(56) + 12 = 168 + 12 = 180
Answer: = 3n + 12, 180
